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or loss.
In order to clean the pump it must either be
dismantled (manual cleaning), or cleaned in place
(CIP) as part of the procedure for cleaning the
entire process. The higher the standard required,
the more sophisticated the cleaning process.
Pumps can be cleaned and sterilized in place, i.e.
by flushing through with cleaning agents and/or
steam, without the need to dismantle the pump.
Equally the pump can be quickly stripped to gain
access to all fluid contact surfaces for manual
cleaning or inspection if required.
5.1 CLEANING IN PLACE (CIP) &
MANUAL CLEANING
Cleaning Systems
The type of cleaning system used depends partly
on the level of cleaning required but also on what
is to be removed.
Organic materials such as oils, fats, proteins need
a different system to inorganic materials such as
mineral salts.
Detergent manufacturers can give advice on the
correct use of chemicals and temperature. CIP
usually needs a velocity of 1.5 m/sec at 1 bar
back pressure through the pipeline to achieve the
turbulent flow required.
Procedure for Cleaning In Place (CIP)
Each pump is supplied in a generally clean
condition but it is the responsibility of the user to
establish suitable cleaning and sterilizing regimes
appropriate to the fluid and process.
These should be implemented before the pump is
first used and as often as required thereafter. The
following guidelines will help with effective
cleaning of HP & LH pumps to minimize risk of
damage to the pump.
•
Rinse through system with a suitable
liquid, usually water at approximately
50°C (120°F), as soon as possible after
completion of the process to remove bulk
of residues before they dry onto surfaces.
•
If CIP will not be carried out immediately
after rinsing, leave the pump and system
full of rinse liquid.
•
Choose chemical cleaning agents to suit
the nature of the contamination to be
removed and use them in accordance with
manufacturer's
temperature and circulation time but do
not
exceed
compatibility with pump materials of
construction.
•
CIP fluid flow should result in a mean
pipeline velocity of at least 1.5 m/sec at 1
bar back pressure.
If using the lobe pump to circulate the CIP
fluid, refer to the Performance Data
Sheet for the pump speed to give the
required flow, taking account of pressure
losses through pipework. NOTE, that all
pumps are more susceptible to cavitation
when
pumping
adequate Net Inlet Pressure is available.
If using a separate pump to circulate CIP
fluids, the lobe pump may need to be
rotated at a speed sufficiently high to
allow the fluid to pass freely through. If
sufficient pipe velocity cannot be achieved,
fit a by-pass loop to divert excess flow
past the pump.
CIP fluid pressures must equal or exceed
process pressure at all points in the
system to ensure fluid reaches all contact
surfaces.
It may be necessary to restrict flow in the
discharge pipework to achieve this but do
not
exceed
differential
temperatures
Performance Data Sheet.
A minimum differential pressure of 1 bar is
recommended for effective cleaning.
•
After CIP, rinse through with neutralizers
and clean water to remove all traces of
cleaning agents.
ATTENTION
Do not pass cold liquid through the pump
immediately after hot – allow temperature to
change slowly. Failure to observe can result in
pump seizure.
Procedure for Manual Cleaning
See elsewhere in this manual for procedures to
dismantle and re-assemble the fluid contact parts.
ATTENTION
recommended
dilution,
90°C
(195°F).
Confirm
hot
liquids.
Ensure
pressure
shown
on
the
pump
and
21
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